I said his music RARELY is impressionistic - MOST of his output is NOT related to impressionism. This is a very important issue because I constantly hear pianists who play pieces like the prelude from Le Tombeau terribly mushy, pedal all over the place, rubato, not paying attention to the text etc etc, and it is probably because they have an idea about Ravel being an impressionist composer so he should be played like Debussys "Images" or something like that. In Ravels orchestration, the opening of the prelude is played by the oboe, it is very melodic, so it should be played the same way on the piano, making a melody out of these figuration. Use pedal sparingly. The way some pianists play the menuet or forlane from this work makes you wonder if they know that these are dances that baroque composers used in suites.
Quoting Wikipedia:
"Ravel considered himself in many ways a classicist. He relied on traditional forms and structures as ways of presenting his new and innovative harmonies. He often masked the sections of his structure with transitions that disguised the beginnings of the motif. This is apparent in his Valses nobles et sentimentales — inspired by Franz Schubert's collections, Valses nobles and Valses sentimentales — where the seven movements begin and end without pause, and in his chamber music where many movements are in sonata-allegro form, hiding the change from developmental sections to recapitulation."
"Musical Impressionism was based in France, and the French composers Claude Debussy and Maurice Ravel are generally considered to be the two "great" Impressionists. However, composers are generally not as accurately described by the term "Impressionism" as painters in the genre are. Debussy renounced it, saying "I am trying to do 'something different'- in a way realities- what the imbeciles call `impressionism' is a term which is as poorly used as possible, particularly by art critics."[1] Maurice Ravel composed many other pieces that aren't identified as Impressionist. Nonetheless, the term is widely used today to describe classical music seen as a reaction to 19th century Romanticism."